279663

Appears in sequences

• a(n)=sum(k=1,n,C(n,n reduced (mod k))).at n=18A072953
• Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 4 1's.at n=6A295199
• Number of nX7 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 4 1s.at n=6A295204